How do birds use the Earth’s magnetic field to navigate their migration paths?

How do birds use the Earth’s magnetic field to navigate their migration paths?. Animals that can sense the Earth’s magnetic field are provided with important navigational information, such as a sense of direction that is associated with the field. Using this compass, along with other parameters such as the intensity of the magnetic field, birds can successfully navigate over long distances. 

It remains a mystery, however, what the birds actually use to sense the conditions of the magnetic field. It is known that birds have tiny magnets that contribute to their navigational ability, yet the precise underlying mechanism is unknown.

Snow Geese Flying

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